"The wife wrote a fairly extensive note explaining that she had stomach cancer, that she was failing and that she was in a lot of pain and she didn't want to fight it anymore," Keller said. "He wrote a note saying that he couldn't live without her."

A caretaker at the cemetery heard two shots around noon Thursday and notified police, said Chief John Tannahill of the Lake County Forest Preserve Ranger Police. They were pronounced dead at the cemetery at 1:26 p.m., officials said.